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This O-ring is made of black Buna-nitrile (Buna-N) and has a durometer of 50A. It has a round cross-section and can be used across a wide temperature range (-30 degrees F/-34 degrees C to 250 degrees F/121 degrees C). Designed for use in a wide variety of sealing applications, this Buna-nitrile O-ring meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.
Buna-nitrile can have high tensile strength, as well as abrasion, tear, and compression set resistance. It is compatible for use with petroleum, hexafluoroacetone (HFA), hexafluoro-2-butyne (HFB) and hydrofluorocarbon (HFC) fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering, and should not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.
The durometer hardness of this Buna O-ring is 50A. Durometers measure the hardness of a material and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation. On a scale of 0 to 100, a value of 0 indicates that a sample was completely penetrated, while a value of 100 shows no indentation in the sample. The letter following the number identifies the shore scale, which is either shore A or D. Shore A is used for softer plastics, while shore D is used for harder plastics.
O-rings provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces and are commonly seen in engines, faucets, flanges, valves, and various cylinders. They are circular in shape, with a round cross section, and a hole in the center, similar to a doughnut. O-rings are available in various AS568A dash sizes, which is the standardized sizing for O-rings, and defines the nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter of an O-ring.
HomCookLove
2025-08-27 19:14:11
That is the right size we need, fit well, no problem after long time use.
klown
2025-08-21 14:17:26
Works on my pool filter discharge valve the price I paid would have only got me 2 at the pool store
Home maintenance man
2025-08-20 12:58:57
Needed this size O ring precisely. Arrived days earlier than predicted and fit perfectly
Tony D.
2025-06-28 17:47:00
I ordered these to replace a defective seal in travel mug lid. Mug vendor doesn't offer replacement seals. New o-ring is thicker than old seal and is round in cross-section. It makes for a really water-tight seal, but affects rotational position of the drink hole when you screw on the lid (which doesn't bug me.) Extra thickness of the o-ring SHOULD insure a long service life. Plus, I got 10 of these babies for the price of one (1) from another vendor. Will report on durability at a later date, after this o-ring is tested by contact with daily hot coffee.
C. Rogers
2025-06-25 16:32:42
These make a proper replacement bands for an aluminum plate wallet that i have had for years. The creators stopped making wallet parts and suggest these as replacements.
Customer
2025-05-25 14:43:22
Needed softer o rings for my application. These are perfect. Had been using 70A durometer rings.
BillyM
2025-04-25 18:43:01
I replaced the pump in my Aquaterra Transport II hot tub and learned the hard way that you should change the o-rings whenever you are working on these connections. After changing the pump, I had a small drip on the outlet side of my pump. Had to drain the tub again and replace the o-rings and then it worked fine. I used some silicon plumbers grease to lightly lube up the o-ring first. This has the added benefit of helping the o-ring to stay put while you put the union back together. For my 2 inch pump and 2 inch MBT union, the #230 o-ring was a perfect fit.
Keri Carlton
2025-03-22 12:12:40
Durameter accuracy.Not sure that these were 50A durometer? Seem to be the same durometer as 70A that I purchased earlier.
yeahman@videotron.ca
2025-03-07 16:48:17
The problem with this O-Ring is that they are not strong , when stretched they weaken . It would be nice if they were thicker ( 1 / 4 inch ).RegardsMarco
Customer
2025-02-20 17:46:30
The size is wrong in the way that it did not state that it was outside diameter. Working in engineering all circular components are given as inside diameter. So this item is too small for my pressure cooker
Peter M.
2025-02-17 21:41:04
Ordered 030 o rings for Sealing OD of 1.75". Gland depth of the part is in spec at 1.651" and the orings are very loose. Will return.
Pat Bruder
2025-02-01 14:47:53
Very good quality and price
mdbrunt
2025-01-22 14:43:11
Used this o ring set up on my 1991 mazda miata cas o ring. Install went well and so far no leaks.
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